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          <h1 class="post-title" itemprop="name headline">Zookeeper核心概念及Java客户端的使用</h1>
        

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        <blockquote>
<p>Zookeeper核心概念及Java客户端的使用</p>
</blockquote>
<h4 id="一、Zookeeper核心概念"><a href="#一、Zookeeper核心概念" class="headerlink" title="一、Zookeeper核心概念"></a>一、Zookeeper核心概念</h4><h5 id="1-什么是znode？"><a href="#1-什么是znode？" class="headerlink" title="1.什么是znode？"></a>1.什么是znode？</h5><p><img src="https://zj820382480.gitee.io/youdaoyun/image/TIM截图20190701002736.png" alt="image"></p>
<p>ZooKeeper操作和维护的为一个个数据节点，称为 znode，采用类似文件系统的层级树状结构进行管理。如果 znode 节点包含数据则存储为字节数组（byte array）。<br>创建 znode 时需要指定节点类型<br>znode 共有 4 种类型，分别为：持久（无序）、临时（无序）、持久有序和临时有序。</p>
<h5 id="2-节点的类型"><a href="#2-节点的类型" class="headerlink" title="2.节点的类型"></a>2.节点的类型</h5><p>2大类、四种类型 持久、临时、持久有序、临时有序<br>  PERSISTENT 持久类型，如果不手动删除 是一直存在的<br>PERSISTENT_SEQUENTIAL<br>  EPHEMERAL 临时 客户端session失效就会随着删除节点 没有子节点<br>EPHEMERAL_SEQUENTIAL 有序 自增 </p>
<p>Stat数据结构：</p>
<p>Stat中记录了这个 ZNode 的三个数据版本，分别是version（当前ZNode的版本）、cversion（当前ZNode子节点的版本）和 cversion（当前ZNode的ACL版本）。<br>Stat：状态信息、版本、权限相关</p>
<p><img src="https://zj820382480.gitee.io/youdaoyun/image/TIM截图20190701003830.png" alt="image"></p>
<p>Session会话：<br>客户端来创建一个和zk服务端连接的句柄。<br>连接状态：CONNECTING\CONNECTED\CLOSED</p>
<h5 id="3-什么是watcher？"><a href="#3-什么是watcher？" class="headerlink" title="3.什么是watcher？"></a>3.什么是watcher？</h5><p>Watcher（事件监听器），是Zookeeper中的一个很重要的特性。Zookeeper允许用户在指定节点上注册一些Watcher，并且在一些特定事件触发的时候，ZooKeeper服务端会将事件通知到感兴趣的客户端上去，该机制是Zookeeper实现分布式协调服务的重要特性。</p>
<p><img src="https://zj820382480.gitee.io/youdaoyun/image/TIM截图20190701003638.png" alt="image"></p>
<h5 id="4-什么是ACL？"><a href="#4-什么是ACL？" class="headerlink" title="4.什么是ACL？"></a>4.什么是ACL？</h5><p>ACL(Access Control List)<br>内置的 ACL schemes：<br>world：默认方式，相当于全世界都能访问<br>auth：代表已经认证通过的用户(cli中可以通过addauth digest user:pwd 来添加当前上下文中的授权用户)<br>digest：即用户名:密码这种方式认证，这也是业务系统中最常用的<br>ip：使用Ip地址认证</p>
<p>ACL支持权限：<br>CREATE: 能创建子节点<br>READ：能获取节点数据和列出其子节点<br>WRITE: 能设置节点数据<br>DELETE: 能删除子节点<br>ADMIN: 能设置权限<br>高性能<br>ZooKeeper 是高性能的。 在“读”多于“写”的应用程序中尤其地高性能，因为“写”会导致所有的服务器间同步状态。（“读”多于“写”是协调服务的典型场景。）<br> 顺序访问<br>对于来自客户端的每个更新请求，ZooKeeper 都会分配一个全局唯一的递增编号，这个编号反应了所有事务操作的先后顺序，应用程序可以使用 ZooKeeper 这个特性来实现更高层次的同步原语。 这个编号也叫做时间戳——zxid（Zookeeper Transaction Id）</p>
<h4 id="二、Java客户端的使用"><a href="#二、Java客户端的使用" class="headerlink" title="二、Java客户端的使用"></a>二、Java客户端的使用</h4><h5 id="1-Zkclient"><a href="#1-Zkclient" class="headerlink" title="1.Zkclient"></a>1.Zkclient</h5><p>ZkClient是由Datameer的工程师开发的开源客户端，对Zookeeper的原生API进行了包装，实现了超时重连、Watcher反复注册等功能。<br>github源代码地址：<a href="https://github.com/sgroschupf/zkclient" target="_blank" rel="noopener">https://github.com/sgroschupf/zkclient</a></p>
<ul>
<li>添加maven依赖</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">&lt;dependency&gt;</span><br><span class="line">     &lt;groupId&gt;org.apache.zookeeper&lt;/groupId&gt;</span><br><span class="line">     &lt;artifactId&gt;zookeeper&lt;/artifactId&gt;</span><br><span class="line">     &lt;version&gt;3.4.9&lt;/version&gt;</span><br><span class="line"> &lt;/dependency&gt;</span><br><span class="line">&lt;dependency&gt;</span><br><span class="line">    &lt;groupId&gt;com.101tec&lt;/groupId&gt;</span><br><span class="line">    &lt;artifactId&gt;zkclient&lt;/artifactId&gt;</span><br><span class="line">    &lt;version&gt;0.10&lt;/version&gt;</span><br><span class="line">&lt;/dependency&gt;</span><br></pre></td></tr></table></figure>
<ul>
<li>zkclient使用</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br></pre></td><td class="code"><pre><span class="line">public ZkClient(String serverstring)</span><br><span class="line">public ZkClient(String zkServers, int connectionTimeout)</span><br><span class="line">public ZkClient(String zkServers, int sessionTimeout, int connectionTimeout)</span><br><span class="line">public ZkClient(String zkServers, int sessionTimeout, int connectionTimeout, ZkSerializer zkSerializer)</span><br><span class="line">public ZkClient(final String zkServers, final int sessionTimeout, final int connectionTimeout, final ZkSerializer zkSerializer, final long operationRetryTimeout)</span><br><span class="line">public ZkClient(IZkConnection connection)</span><br><span class="line">public ZkClient(IZkConnection connection, int connectionTimeout)</span><br><span class="line">public ZkClient(IZkConnection zkConnection, int connectionTimeout, ZkSerializer zkSerializer)</span><br><span class="line">public ZkClient(final IZkConnection zkConnection, final int connectionTimeout, final ZkSerializer zkSerializer, final long operationRetryTimeout)</span><br><span class="line">创建节点</span><br><span class="line">public void createPersistent(String path)</span><br><span class="line">public void createPersistent(String path, boolean createParents)</span><br><span class="line">public void createPersistent(String path, boolean createParents, List&lt;ACL&gt; acl)</span><br><span class="line">public void createPersistent(String path, Object data)</span><br><span class="line">public void createPersistent(String path, Object data, List&lt;ACL&gt; acl)</span><br><span class="line">public String createPersistentSequential(String path, Object data)</span><br><span class="line">public String createPersistentSequential(String path, Object data, List&lt;ACL&gt; acl) </span><br><span class="line">public void createEphemeral(final String path)</span><br><span class="line">public void createEphemeral(final String path, final List&lt;ACL&gt; acl)</span><br><span class="line">public String create(final String path, Object data, final CreateMode mode)</span><br><span class="line">public String create(final String path, Object data, final List&lt;ACL&gt; acl, final CreateMode mode) </span><br><span class="line">public void createEphemeral(final String path, final Object data)</span><br><span class="line">public void createEphemeral(final String path, final Object data, final List&lt;ACL&gt; acl)</span><br><span class="line">public String createEphemeralSequential(final String path, final Object data)</span><br><span class="line">public String createEphemeralSequential(final String path, final Object data, final List&lt;ACL&gt; acl)</span><br><span class="line">删除节点：</span><br><span class="line">public boolean delete(final String path)</span><br><span class="line">public boolean delete(final String path, final int version)</span><br><span class="line">public boolean deleteRecursive(String path)</span><br><span class="line">读取列表：</span><br><span class="line">public List&lt;String&gt; getChildren(String path)</span><br><span class="line">获取节点内容：</span><br><span class="line">public &lt;T extends Object&gt; T readData(String path)</span><br><span class="line">public &lt;T extends Object&gt; T readData(String path, boolean returnNullIfPathNotExists)</span><br><span class="line">public &lt;T extends Object&gt; T readData(String path, Stat stat)</span><br><span class="line">更新内容：</span><br><span class="line">public void writeData(String path, Object object)</span><br><span class="line">public void writeData(final String path, Object datat, final int expectedVersion)</span><br><span class="line">public Stat writeDataReturnStat(final String path, Object datat, final int expectedVersion)</span><br><span class="line"></span><br><span class="line">监测节点是否存在</span><br><span class="line">protected boolean exists(final String path, final boolean watch)</span><br><span class="line"></span><br><span class="line">注册监听</span><br><span class="line">接口类	注册监听方法	解除监听方法</span><br><span class="line">IZkChildListener	ZkClient的subscribeChildChanges方法	ZkClient的unsubscribeChildChanges方法</span><br><span class="line">IZkDataListener	ZkClient的subscribeDataChanges方法	ZkClient的subscribeChildChanges方法</span><br><span class="line">IZkStateListener	ZkClient的subscribeStateChanges方法	ZkClient的unsubscribeStateChanges方法</span><br><span class="line">其中ZkClient还提供了一个unsubscribeAll方法，来解除所有监听。</span><br></pre></td></tr></table></figure>
<h5 id="2-Curator"><a href="#2-Curator" class="headerlink" title="2.Curator"></a>2.Curator</h5><p>Curator 是 Netflix 公司开源的一个 Zookeeper 客户端，与 Zookeeper 提供的原生客户端<br>相比，Curator 的抽象层次更高，简化了 Zookeeper 客户端的开发量。现在已是 apache 的<br>顶级开源框架，Fluent 编程风格的实现。<br>官网:<a href="http://curator.apache.org" target="_blank" rel="noopener">http://curator.apache.org</a></p>
<ul>
<li>添加maven依赖</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">&lt;dependency&gt;</span><br><span class="line">	&lt;groupId&gt;org.apache.curator&lt;/groupId&gt; &lt;!--基础框架--&gt;</span><br><span class="line">	&lt;artifactId&gt;curator-framework&lt;/artifactId&gt;</span><br><span class="line">	&lt;version&gt;&lt;/version&gt;</span><br><span class="line">&lt;/dependency&gt;</span><br><span class="line"></span><br><span class="line">&lt;dependency&gt;</span><br><span class="line">	&lt;groupId&gt;org.apache.curator&lt;/groupId&gt; &lt;!--功能 jar 分布式锁、队列等--&gt;</span><br><span class="line">	&lt;artifactId&gt;curator-recipes&lt;/artifactId&gt;</span><br><span class="line">	&lt;version&gt;&lt;/version&gt;</span><br><span class="line">&lt;/dependency&gt;</span><br><span class="line"></span><br><span class="line">&lt;dependency&gt; </span><br><span class="line">	&lt;groupId&gt;org.apache.curator&lt;/groupId&gt; &lt;!--客户端重试策略--&gt;</span><br><span class="line">	&lt;artifactId&gt;curator-client&lt;/artifactId&gt;</span><br><span class="line">	&lt;version&gt;&lt;/version&gt;</span><br><span class="line">&lt;/dependency&gt;</span><br></pre></td></tr></table></figure>
<ul>
<li>使用:</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br></pre></td><td class="code"><pre><span class="line">Curator 框架提供了一种流式接口,通过 builder 串起来，传递参数都是调方法。</span><br><span class="line">Curator 框架通过 CuratorFrameworkFactory 以工厂模式和 builder 模式创建</span><br><span class="line">CuratorFramework 实 例。 CuratorFramework 实例都是线程安全的，你应该在你的应用中</span><br><span class="line">共享同一个.</span><br><span class="line">工厂方法 newClient()提供了一个简单方式创建实例。 而 Builder 提供了更多的参数控制。</span><br><span class="line">一旦你创建了一个 CuratorFramework 实例，你必须调用它的 start()启动，在应用退出时调</span><br><span class="line">用 close()方法关闭.</span><br><span class="line">1.创建 Curator 连接实例</span><br><span class="line">String address = &quot;localhost:2181&quot;;</span><br><span class="line">CuratorFramework client = CuratorFrameworkFactory.newClient(address, new</span><br><span class="line">ExponentialBackoffRetry(1000, 3));//重试机制</span><br><span class="line">client.start();</span><br><span class="line"></span><br><span class="line">注意：一个 Zookeeper 集群只需要构造一个 CuratorFramework 实例对象即可。</span><br><span class="line">CuratorFramework 使用之前必须先调用client.start();</span><br><span class="line"></span><br><span class="line">CuratorFramework 提供的方法：</span><br><span class="line">方法名 描述</span><br><span class="line">create 开始创建操作， 可以调用额外的方法(比如方式 mode 或者后台执行 background) 并在最后调用 forPath()指定要操作的 ZNode</span><br><span class="line">Delete 开始删除操作. 可以调用额外的方法(版本或者后台处理 version orbackground)并在最后调用 forPath()指定要操作的 ZNode</span><br><span class="line">checkExists 开始检查 ZNode 是否存在的操作. 可以调用额外的方法(监控或者后台处理)并在最后调用 forPath()指定要操作的 ZNode</span><br><span class="line">getData 开始获得 ZNode 节点数据的操作. 可以调用额外的方法(监控、后台处理或者获取状态 watch, background or get stat) 并在最后调用 forPath()指定要操作的 ZNode</span><br><span class="line">setData 开始设置 ZNode 节点数据的操作. 可以调用额外的方法(版本或者后台处理) 并在最后调用 forPath()指定要操作的 ZNode</span><br><span class="line">getChildren 开始获得 ZNode 的子节点列表。 以调用额外的方法(监控、后台处理或者获取状态 watch, background or get stat) 并在最后调用 forPath()指定要操作的 ZNode</span><br><span class="line">inTransaction 开始是原子 ZooKeeper 事务. 可以复合 create, setData, check, and/or</span><br><span class="line">delete 等操作然后调用 commit()作为一个原子操作提交</span><br><span class="line"></span><br><span class="line">事件类型以及事件的方法如下：</span><br><span class="line"></span><br><span class="line">EventType EventMethods</span><br><span class="line">CREATE getResultCode() and getPath()</span><br><span class="line">DELETE getResultCode() and getPath()</span><br><span class="line">EXISTS getResultCode(), getPath() and getStat()</span><br><span class="line">GETDATA getResultCode(), getPath(), getStat() andgetData()</span><br><span class="line">SETDATA getResultCode(), getPath() and getStat()</span><br><span class="line">CHILDREN getResultCode(), getPath(), getStat(),getChildren()</span><br><span class="line">WATCHED getWatchedEvent</span><br><span class="line"></span><br><span class="line">监听器</span><br><span class="line"></span><br><span class="line">Curator 提供了三种 Watcher(Cache)来监听结点的变化：</span><br><span class="line">Path Cache：监视一个路径下子结点的创建、删除，以及结点数据的更新。产生的</span><br><span class="line">事件会传递给注册的 PathChildrenCacheListener。</span><br><span class="line">Node Cache：监视一个结点的创建、更新、删除，并将结点的数据缓存在本地。</span><br><span class="line">Tree Cache：Path Cache 和 Node Cache 的“合体”，监视路径下的创建、更新、删</span><br><span class="line">除事件，并缓存路径下所有子结点的数据。</span><br><span class="line"></span><br><span class="line">重试机制</span><br><span class="line">Curator 内部实现的几种重试策略:</span><br><span class="line">1.ExponentialBackoffRetry:重试指定的次数, 且每一次重试之间停顿的时间逐渐增加.</span><br><span class="line">2.RetryNTimes:指定最大重试次数的重试策略</span><br><span class="line">3.RetryOneTime:仅重试一次</span><br><span class="line">4.RetryUntilElapsed:一直重试直到达到规定的时间</span><br></pre></td></tr></table></figure>
<p>代码示例：<a href="https://github.com/cnsyear/tuling-zookeeper.git" target="_blank" rel="noopener">https://github.com/cnsyear/tuling-zookeeper.git</a></p>

      
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              <div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-4"><a class="nav-link" href="#一、Zookeeper核心概念"><span class="nav-number">1.</span> <span class="nav-text">一、Zookeeper核心概念</span></a><ol class="nav-child"><li class="nav-item nav-level-5"><a class="nav-link" href="#1-什么是znode？"><span class="nav-number">1.1.</span> <span class="nav-text">1.什么是znode？</span></a></li><li class="nav-item nav-level-5"><a class="nav-link" href="#2-节点的类型"><span class="nav-number">1.2.</span> <span class="nav-text">2.节点的类型</span></a></li><li class="nav-item nav-level-5"><a class="nav-link" href="#3-什么是watcher？"><span class="nav-number">1.3.</span> <span class="nav-text">3.什么是watcher？</span></a></li><li class="nav-item nav-level-5"><a class="nav-link" href="#4-什么是ACL？"><span class="nav-number">1.4.</span> <span class="nav-text">4.什么是ACL？</span></a></li></ol></li><li class="nav-item nav-level-4"><a class="nav-link" href="#二、Java客户端的使用"><span class="nav-number">2.</span> <span class="nav-text">二、Java客户端的使用</span></a><ol class="nav-child"><li class="nav-item nav-level-5"><a class="nav-link" href="#1-Zkclient"><span class="nav-number">2.1.</span> <span class="nav-text">1.Zkclient</span></a></li><li class="nav-item nav-level-5"><a class="nav-link" href="#2-Curator"><span class="nav-number">2.2.</span> <span class="nav-text">2.Curator</span></a></li></ol></li></ol></div>
            

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  <script type="text/javascript">
    // Popup Window;
    var isfetched = false;
    var isXml = true;
    // Search DB path;
    var search_path = "search.xml";
    if (search_path.length === 0) {
      search_path = "search.xml";
    } else if (/json$/i.test(search_path)) {
      isXml = false;
    }
    var path = "/" + search_path;
    // monitor main search box;

    var onPopupClose = function (e) {
      $('.popup').hide();
      $('#local-search-input').val('');
      $('.search-result-list').remove();
      $('#no-result').remove();
      $(".local-search-pop-overlay").remove();
      $('body').css('overflow', '');
    }

    function proceedsearch() {
      $("body")
        .append('<div class="search-popup-overlay local-search-pop-overlay"></div>')
        .css('overflow', 'hidden');
      $('.search-popup-overlay').click(onPopupClose);
      $('.popup').toggle();
      var $localSearchInput = $('#local-search-input');
      $localSearchInput.attr("autocapitalize", "none");
      $localSearchInput.attr("autocorrect", "off");
      $localSearchInput.focus();
    }

    // search function;
    var searchFunc = function(path, search_id, content_id) {
      'use strict';

      // start loading animation
      $("body")
        .append('<div class="search-popup-overlay local-search-pop-overlay">' +
          '<div id="search-loading-icon">' +
          '<i class="fa fa-spinner fa-pulse fa-5x fa-fw"></i>' +
          '</div>' +
          '</div>')
        .css('overflow', 'hidden');
      $("#search-loading-icon").css('margin', '20% auto 0 auto').css('text-align', 'center');

      $.ajax({
        url: path,
        dataType: isXml ? "xml" : "json",
        async: true,
        success: function(res) {
          // get the contents from search data
          isfetched = true;
          $('.popup').detach().appendTo('.header-inner');
          var datas = isXml ? $("entry", res).map(function() {
            return {
              title: $("title", this).text(),
              content: $("content",this).text(),
              url: $("url" , this).text()
            };
          }).get() : res;
          var input = document.getElementById(search_id);
          var resultContent = document.getElementById(content_id);
          var inputEventFunction = function() {
            var searchText = input.value.trim().toLowerCase();
            var keywords = searchText.split(/[\s\-]+/);
            if (keywords.length > 1) {
              keywords.push(searchText);
            }
            var resultItems = [];
            if (searchText.length > 0) {
              // perform local searching
              datas.forEach(function(data) {
                var isMatch = false;
                var hitCount = 0;
                var searchTextCount = 0;
                var title = data.title.trim();
                var titleInLowerCase = title.toLowerCase();
                var content = data.content.trim().replace(/<[^>]+>/g,"");
                var contentInLowerCase = content.toLowerCase();
                var articleUrl = decodeURIComponent(data.url);
                var indexOfTitle = [];
                var indexOfContent = [];
                // only match articles with not empty titles
                if(title != '') {
                  keywords.forEach(function(keyword) {
                    function getIndexByWord(word, text, caseSensitive) {
                      var wordLen = word.length;
                      if (wordLen === 0) {
                        return [];
                      }
                      var startPosition = 0, position = [], index = [];
                      if (!caseSensitive) {
                        text = text.toLowerCase();
                        word = word.toLowerCase();
                      }
                      while ((position = text.indexOf(word, startPosition)) > -1) {
                        index.push({position: position, word: word});
                        startPosition = position + wordLen;
                      }
                      return index;
                    }

                    indexOfTitle = indexOfTitle.concat(getIndexByWord(keyword, titleInLowerCase, false));
                    indexOfContent = indexOfContent.concat(getIndexByWord(keyword, contentInLowerCase, false));
                  });
                  if (indexOfTitle.length > 0 || indexOfContent.length > 0) {
                    isMatch = true;
                    hitCount = indexOfTitle.length + indexOfContent.length;
                  }
                }

                // show search results

                if (isMatch) {
                  // sort index by position of keyword

                  [indexOfTitle, indexOfContent].forEach(function (index) {
                    index.sort(function (itemLeft, itemRight) {
                      if (itemRight.position !== itemLeft.position) {
                        return itemRight.position - itemLeft.position;
                      } else {
                        return itemLeft.word.length - itemRight.word.length;
                      }
                    });
                  });

                  // merge hits into slices

                  function mergeIntoSlice(text, start, end, index) {
                    var item = index[index.length - 1];
                    var position = item.position;
                    var word = item.word;
                    var hits = [];
                    var searchTextCountInSlice = 0;
                    while (position + word.length <= end && index.length != 0) {
                      if (word === searchText) {
                        searchTextCountInSlice++;
                      }
                      hits.push({position: position, length: word.length});
                      var wordEnd = position + word.length;

                      // move to next position of hit

                      index.pop();
                      while (index.length != 0) {
                        item = index[index.length - 1];
                        position = item.position;
                        word = item.word;
                        if (wordEnd > position) {
                          index.pop();
                        } else {
                          break;
                        }
                      }
                    }
                    searchTextCount += searchTextCountInSlice;
                    return {
                      hits: hits,
                      start: start,
                      end: end,
                      searchTextCount: searchTextCountInSlice
                    };
                  }

                  var slicesOfTitle = [];
                  if (indexOfTitle.length != 0) {
                    slicesOfTitle.push(mergeIntoSlice(title, 0, title.length, indexOfTitle));
                  }

                  var slicesOfContent = [];
                  while (indexOfContent.length != 0) {
                    var item = indexOfContent[indexOfContent.length - 1];
                    var position = item.position;
                    var word = item.word;
                    // cut out 100 characters
                    var start = position - 20;
                    var end = position + 80;
                    if(start < 0){
                      start = 0;
                    }
                    if (end < position + word.length) {
                      end = position + word.length;
                    }
                    if(end > content.length){
                      end = content.length;
                    }
                    slicesOfContent.push(mergeIntoSlice(content, start, end, indexOfContent));
                  }

                  // sort slices in content by search text's count and hits' count

                  slicesOfContent.sort(function (sliceLeft, sliceRight) {
                    if (sliceLeft.searchTextCount !== sliceRight.searchTextCount) {
                      return sliceRight.searchTextCount - sliceLeft.searchTextCount;
                    } else if (sliceLeft.hits.length !== sliceRight.hits.length) {
                      return sliceRight.hits.length - sliceLeft.hits.length;
                    } else {
                      return sliceLeft.start - sliceRight.start;
                    }
                  });

                  // select top N slices in content

                  var upperBound = parseInt('1');
                  if (upperBound >= 0) {
                    slicesOfContent = slicesOfContent.slice(0, upperBound);
                  }

                  // highlight title and content

                  function highlightKeyword(text, slice) {
                    var result = '';
                    var prevEnd = slice.start;
                    slice.hits.forEach(function (hit) {
                      result += text.substring(prevEnd, hit.position);
                      var end = hit.position + hit.length;
                      result += '<b class="search-keyword">' + text.substring(hit.position, end) + '</b>';
                      prevEnd = end;
                    });
                    result += text.substring(prevEnd, slice.end);
                    return result;
                  }

                  var resultItem = '';

                  if (slicesOfTitle.length != 0) {
                    resultItem += "<li><a href='" + articleUrl + "' class='search-result-title'>" + highlightKeyword(title, slicesOfTitle[0]) + "</a>";
                  } else {
                    resultItem += "<li><a href='" + articleUrl + "' class='search-result-title'>" + title + "</a>";
                  }

                  slicesOfContent.forEach(function (slice) {
                    resultItem += "<a href='" + articleUrl + "'>" +
                      "<p class=\"search-result\">" + highlightKeyword(content, slice) +
                      "...</p>" + "</a>";
                  });

                  resultItem += "</li>";
                  resultItems.push({
                    item: resultItem,
                    searchTextCount: searchTextCount,
                    hitCount: hitCount,
                    id: resultItems.length
                  });
                }
              })
            };
            if (keywords.length === 1 && keywords[0] === "") {
              resultContent.innerHTML = '<div id="no-result"><i class="fa fa-search fa-5x" /></div>'
            } else if (resultItems.length === 0) {
              resultContent.innerHTML = '<div id="no-result"><i class="fa fa-frown-o fa-5x" /></div>'
            } else {
              resultItems.sort(function (resultLeft, resultRight) {
                if (resultLeft.searchTextCount !== resultRight.searchTextCount) {
                  return resultRight.searchTextCount - resultLeft.searchTextCount;
                } else if (resultLeft.hitCount !== resultRight.hitCount) {
                  return resultRight.hitCount - resultLeft.hitCount;
                } else {
                  return resultRight.id - resultLeft.id;
                }
              });
              var searchResultList = '<ul class=\"search-result-list\">';
              resultItems.forEach(function (result) {
                searchResultList += result.item;
              })
              searchResultList += "</ul>";
              resultContent.innerHTML = searchResultList;
            }
          }

          if ('auto' === 'auto') {
            input.addEventListener('input', inputEventFunction);
          } else {
            $('.search-icon').click(inputEventFunction);
            input.addEventListener('keypress', function (event) {
              if (event.keyCode === 13) {
                inputEventFunction();
              }
            });
          }

          // remove loading animation
          $(".local-search-pop-overlay").remove();
          $('body').css('overflow', '');

          proceedsearch();
        }
      });
    }

    // handle and trigger popup window;
    $('.popup-trigger').click(function(e) {
      e.stopPropagation();
      if (isfetched === false) {
        searchFunc(path, 'local-search-input', 'local-search-result');
      } else {
        proceedsearch();
      };
    });

    $('.popup-btn-close').click(onPopupClose);
    $('.popup').click(function(e){
      e.stopPropagation();
    });
    $(document).on('keyup', function (event) {
      var shouldDismissSearchPopup = event.which === 27 &&
        $('.search-popup').is(':visible');
      if (shouldDismissSearchPopup) {
        onPopupClose();
      }
    });
  </script>





  

  

  
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